810f250
Griffs Services PowerWash
The burner I suggest you call whitco first and give them the model # and they would direct you as to the gpm input vs heat rise and coil pressure rating.
For the pump: (20 x 1100)/gpm = psi, so figure how much GPM you want to run, plug it in to the formula and you will get the maximum sustained 'psi". Running a gearbox would be much easier that sourcing the rails, pulleys and frame. gearbox = plug 'n' play.